[
  {
    "Question": "What is 752 - 489?",
    "Answer": "B",
    "Explanation": "To subtract 489 from 752, we regroup. Starting from the right, we need to borrow from the tens place to subtract 9 from 2, which gives us 12 - 9 = 3. Then, we subtract 8 from 4 (after borrowing) which gives us 6, and finally, 7 - 4 = 3. So, the answer is 263.",
    "PictureURL": "",
    "OptionA": "263",
    "OptionB": "263",
    "OptionC": "243",
    "OptionD": "223",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 3-digit numbers",
    "Item": 1,
    "Type": "multiple choice",
    "Path": "math/subtraction/3-digit"
  },
  {
    "Question": "What is 1,204 - 678?",
    "Answer": "A",
    "Explanation": "To subtract 678 from 1,204, we start from the right. We need to borrow from the tens place to subtract 8 from 4, which gives us 14 - 8 = 6. Next, we subtract 7 from 0 (after borrowing) which requires another borrow, giving us 11 - 7 = 4. Finally, 1 - 0 = 1. Thus, the answer is 526.",
    "PictureURL": "",
    "OptionA": "526",
    "OptionB": "536",
    "OptionC": "546",
    "OptionD": "516",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 4-digit numbers",
    "Item": 2,
    "Type": "multiple choice",
    "Path": "math/subtraction/4-digit"
  },
  {
    "Question": "What is 845 - 279?",
    "Answer": "C",
    "Explanation": "When subtracting 279 from 845, we start from the right. We need to borrow from the tens place to subtract 9 from 5, which gives us 15 - 9 = 6. Next, we subtract 7 from 3 (after borrowing) which gives us 6 - 7 = -1, so we borrow again, making it 13 - 7 = 6. Finally, 7 - 2 = 5. Therefore, the answer is 566.",
    "PictureURL": "",
    "OptionA": "566",
    "OptionB": "576",
    "OptionC": "566",
    "OptionD": "556",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 3-digit numbers",
    "Item": 3,
    "Type": "multiple choice",
    "Path": "math/subtraction/3-digit"
  },
  {
    "Question": "What is 3,456 - 1,289?",
    "Answer": "D",
    "Explanation": "To subtract 1,289 from 3,456, we start from the right. We need to borrow to subtract 9 from 6, which gives us 16 - 9 = 7. Next, we subtract 8 from 5 (after borrowing) which gives us 15 - 8 = 7. Finally, 3 - 1 = 2. Thus, the answer is 2,167.",
    "PictureURL": "",
    "OptionA": "2,167",
    "OptionB": "2,177",
    "OptionC": "2,157",
    "OptionD": "2,167",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 4-digit numbers",
    "Item": 4,
    "Type": "multiple choice",
    "Path": "math/subtraction/4-digit"
  },
  {
    "Question": "What is 905 - 478?",
    "Answer": "A",
    "Explanation": "To subtract 478 from 905, we start from the right. We need to borrow to subtract 8 from 5, which gives us 15 - 8 = 7. Next, we subtract 7 from 0 (after borrowing) which gives us 10 - 7 = 3. Finally, 8 - 4 = 4. Therefore, the answer is 427.",
    "PictureURL": "",
    "OptionA": "427",
    "OptionB": "437",
    "OptionC": "447",
    "OptionD": "457",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 3-digit numbers",
    "Item": 5,
    "Type": "multiple choice",
    "Path": "math/subtraction/3-digit"
  },
  {
    "Question": "What is 2,500 - 1,736?",
    "Answer": "B",
    "Explanation": "To subtract 1,736 from 2,500, we start from the right. We need to borrow to subtract 6 from 0, which gives us 10 - 6 = 4. Next, we subtract 3 from 9 (after borrowing) which gives us 8 - 3 = 5. Finally, 2 - 1 = 1. Thus, the answer is 764.",
    "PictureURL": "",
    "OptionA": "764",
    "OptionB": "764",
    "OptionC": "754",
    "OptionD": "744",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 4-digit numbers",
    "Item": 6,
    "Type": "multiple choice",
    "Path": "math/subtraction/4-digit"
  },
  {
    "Question": "What is 1,000 - 456?",
    "Answer": "C",
    "Explanation": "To subtract 456 from 1,000, we start from the right. We need to borrow to subtract 6 from 0, which gives us 10 - 6 = 4. Next, we subtract 5 from 9 (after borrowing) which gives us 9 - 5 = 4. Finally, 0 - 4 = -4, so we borrow again, making it 9 - 4 = 5. Thus, the answer is 544.",
    "PictureURL": "",
    "OptionA": "554",
    "OptionB": "534",
    "OptionC": "544",
    "OptionD": "524",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 4-digit numbers",
    "Item": 7,
    "Type": "multiple choice",
    "Path": "math/subtraction/4-digit"
  },
  {
    "Question": "What is 678 - 345?",
    "Answer": "A",
    "Explanation": "To subtract 345 from 678, we start from the right. We need to borrow to subtract 5 from 8, which gives us 13 - 5 = 8. Next, we subtract 4 from 6 (after borrowing) which gives us 2. Finally, 6 - 3 = 3. Therefore, the answer is 333.",
    "PictureURL": "",
    "OptionA": "333",
    "OptionB": "343",
    "OptionC": "353",
    "OptionD": "363",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 3-digit numbers",
    "Item": 8,
    "Type": "multiple choice",
    "Path": "math/subtraction/3-digit"
  },
  {
    "Question": "What is 4,000 - 2,345?",
    "Answer": "B",
    "Explanation": "To subtract 2,345 from 4,000, we start from the right. We need to borrow to subtract 5 from 0, which gives us 10 - 5 = 5. Next, we subtract 4 from 9 (after borrowing) which gives us 6 - 4 = 2. Finally, 3 - 2 = 1. Thus, the answer is 1,655.",
    "PictureURL": "",
    "OptionA": "1,655",
    "OptionB": "1,655",
    "OptionC": "1,645",
    "OptionD": "1,675",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 4-digit numbers",
    "Item": 9,
    "Type": "multiple choice",
    "Path": "math/subtraction/4-digit"
  },
  {
    "Question": "What is 2,222 - 1,111?",
    "Answer": "C",
    "Explanation": "To subtract 1,111 from 2,222, we start from the right. We subtract 1 from 2, which gives us 1. Next, we subtract 1 from 2, which gives us 1 again. The same applies for the next two digits. Thus, the answer is 1,111.",
    "PictureURL": "",
    "OptionA": "1,111",
    "OptionB": "1,121",
    "OptionC": "1,111",
    "OptionD": "1,101",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 4-digit numbers",
    "Item": 10,
    "Type": "multiple choice",
    "Path": "math/subtraction/4-digit"
  },
  {
    "Question": "What is 1,500 - 789?",
    "Answer": "B",
    "Explanation": "To subtract 789 from 1,500, we start from the right. We need to borrow to subtract 9 from 0, which gives us 10 - 9 = 1. Next, we subtract 8 from 9 (after borrowing) which gives us 1. Finally, 4 - 7 = -3, so we borrow again, making it 14 - 7 = 7. Thus, the answer is 711.",
    "PictureURL": "",
    "OptionA": "711",
    "OptionB": "711",
    "OptionC": "721",
    "OptionD": "731",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 4-digit numbers",
    "Item": 11,
    "Type": "multiple choice",
    "Path": "math/subtraction/4-digit"
  },
  {
    "Question": "What is 3,000 - 1,234?",
    "Answer": "A",
    "Explanation": "To subtract 1,234 from 3,000, we start from the right. We need to borrow to subtract 4 from 0, which gives us 10 - 4 = 6. Next, we subtract 3 from 9 (after borrowing) which gives us 6 - 3 = 3. Finally, 2 - 1 = 1. Thus, the answer is 1,766.",
    "PictureURL": "",
    "OptionA": "1,766",
    "OptionB": "1,776",
    "OptionC": "1,786",
    "OptionD": "1,796",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 4-digit numbers",
    "Item": 12,
    "Type": "multiple choice",
    "Path": "math/subtraction/4-digit"
  },
  {
    "Question": "What is 2,800 - 1,456?",
    "Answer": "C",
    "Explanation": "To subtract 1,456 from 2,800, we start from the right. We need to borrow to subtract 6 from 0, which gives us 10 - 6 = 4. Next, we subtract 5 from 9 (after borrowing) which gives us 8 - 5 = 3. Finally, 2 - 1 = 1. Thus, the answer is 1,344.",
    "PictureURL": "",
    "OptionA": "1,344",
    "OptionB": "1,354",
    "OptionC": "1,344",
    "OptionD": "1,364",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 4-digit numbers",
    "Item": 13,
    "Type": "multiple choice",
    "Path": "math/subtraction/4-digit"
  },
  {
    "Question": "What is 1,234 - 567?",
    "Answer": "B",
    "Explanation": "To subtract 567 from 1,234, we start from the right. We need to borrow to subtract 7 from 4, which gives us 14 - 7 = 7. Next, we subtract 6 from 2 (after borrowing) which gives us 12 - 6 = 6. Finally, 1 - 0 = 1. Thus, the answer is 667.",
    "PictureURL": "",
    "OptionA": "667",
    "OptionB": "667",
    "OptionC": "677",
    "OptionD": "657",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 4-digit numbers",
    "Item": 14,
    "Type": "multiple choice",
    "Path": "math/subtraction/4-digit"
  },
  {
    "Question": "What is 5,000 - 2,345?",
    "Answer": "A",
    "Explanation": "To subtract 2,345 from 5,000, we start from the right. We need to borrow to subtract 5 from 0, which gives us 10 - 5 = 5. Next, we subtract 4 from 9 (after borrowing) which gives us 6 - 4 = 2. Finally, 4 - 2 = 2. Thus, the answer is 2,655.",
    "PictureURL": "",
    "OptionA": "2,655",
    "OptionB": "2,645",
    "OptionC": "2,675",
    "OptionD": "2,685",
    "OptionE": "",
    "OptionF": "",
    "OptionG": "",
    "TestName": "Subtracting 3-digit and 4-digit numbers with regrouping",
    "Content Type": "Math",
    "Title": "Subtracting 4-digit numbers",
    "Item": 15,
    "Type": "multiple choice",
    "Path": "math/subtraction/4-digit"
  }
]